jeremyo83
Meter Reader 1st Class
Posts: 81
Likes: 0
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Post by jeremyo83 on Oct 17, 2006 12:16:04 GMT -5
Is there any way to test if a pickup is rw/rp?
I have a pickup that I'm putting in the middle of my strat, and I'm not sure if it is or not. I don't think it will affect my decision to use it, I'm mostly just curious.
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Post by ChrisK on Oct 17, 2006 19:29:48 GMT -5
Well, the RW part is easy, it doesn't matter.
The RP (magnet) part is harder. If the pickup poles stick to another pickup (top to top), then the pickups are RP. Just reverse the wires on one for the RW.
If the poles repel, aside from reversing the magnets which will be death to the pickup, there's not much that can be done aside from re-magnetizing the poles/magnets (see StewMac.com).
Reversing the magnets can work on some Fender style single coils with an internal bobbin that isolates the magnets from the coil. Unfortunately, you won't know this until it's too late for the non-isolated pickup.
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Post by UnklMickey on Oct 18, 2006 14:46:41 GMT -5
...If the pickup poles stick to another pickup (top to top), then the pickups are RP. Just reverse the wires on one for the RW.... maybe Chris, but maybe not. the colors on the pickup may (probably?) indicate relative + or - on the string sensing, rather than winding direction. |
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Post by ChrisK on Oct 18, 2006 18:14:32 GMT -5
Hmmmm, well since opposite magnet polarity is necessary for hum cancellation (cuz opposite winding direction is paramount and two things must change to even things out regarding signal phase), having such freely allows winding connection changes.
Two of the three parameters must change to preserve phase; magnet polarity, winding direction, and string vibrational direction. Since opposite winding direction alone leads to hum cancellation between two coils, for common phasing, either the magnets must be of opposite polarity or the pickup's differential string movement must be opposite ("somewhat" physically difficult to do). The side to side movement of a string has (considerably) less to do with signal generation than the towards the pole and away movement.
Hence only the relative magnetic polarity matters as an absolute.
Most likely, but again, only the relative magnetic polarity really matters......
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Post by UnklMickey on Oct 18, 2006 19:02:07 GMT -5
...but again, only the relative magnetic polarity really matters...... absolutely..............................but looking at it another way, NO. relative magnetic polarity is key in determining whether 2 SCs can hum-cancel. if they have the SAME magnetic polarity, they can ONLY hum-cancel when they are connected OoP (string sensing). if they have the OPPOSITE magnetic polarity, they can ONLY hum-cancel when they are connected InPhase (string sensing). so for in-phase use, we obviously need to use 2 SCs that opposite magnetic polarity. but, in the case (you mentioned above) that they already DO have opposite magnetic polarity, will the wires need to be reversed? or do the colors already indicate the (in-phase) string sensing polarity? unk |
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